$page-margin-y: 20px;
$page-margin-x: 20px;

$width: "calc(50vw - (%s))" % $page-margin-x;
$half-width: "calc(50vw - (%s))" % ($page-margin-x / 2);
$neg-half-width: "calc(-25vw + %s)" % ($page-margin-x / 2);

$height: "calc(100vh - %s)" % ($page-margin-y * 2);
$half-height: "calc(50vh - %s)" % $page-margin-y;
$neg-half-height: "calc(-50vh + %s)" % $page-margin-y;

$transition-dur: 1s;

html, 
body {
  height: 100%;
  padding: 0;
  margin: 0;
}

body {
  background: #fff;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}.js-transitions-disabled * {
  transition: none !important;
}.carousel {
  position: relative;
  height: 100%;
  overflow: hidden;
  perspective: 50vw;
  perspective-origin: 50% 50%;
}.carousel__control {
  position: absolute;
  height: 160px;
  width: 40px;
  background: #fff;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
  z-index: 1;

  a {
    position: relative;
    display: block;
    width: 100%;
    padding-top: 75%;
    box-sizing: border-box;&:hover:before {
      background-color: rgba(0, 0, 0, 0.4);
    }&.active:before, 
    &.active:hover:before {
      background-color: rgba(0, 0, 0, 0.6);
    }&:first-child {
      margin-top: 15px;
    }&:before {
      position: absolute;
      top: 50%;
      left: 0;
      right: 0;
      margin: auto;
      border-radius: 50%;
      padding-top: 25%;
      width: 25%;
      background: rgba(0, 0, 0, 0.2);
      content: '';
      display: block;
      margin-top: -12.5%;
    }
  }
}.carousel__stage {
  position: absolute;
  top: $page-margin-y;
  bottom: $page-margin-y;
  left: $page-margin-x;
  right: $page-margin-x;
  margin: auto;
  transform-style: preserve-3d;
  transform: translateZ($neg-half-height);
}.spinner {
  position: absolute;
  width: $width;
  height: $height;
  top: 0;
  left: 0;
  right: auto;
  bottom: 0;
  margin: auto;
  transform-style: preserve-3d;
  transition: transform $transition-dur;
  backface-visibility: hidden;
  transform-origin: 50% 50%;
  transform: rotateX(0);.js-spin-fwd & {
    transform: rotateX(-90deg);
  }.js-spin-bwd & {
    transform: rotateX(90deg);
  }
}.spinner--right {
  .js-spin-fwd & {
    transform: rotateX(90deg);
  }.js-spin-bwd & {
    transform: rotateX(-90deg);
  }
}.spinner--right {
  right: 0;
  left: auto;
}.spinner__face {
  display: none;
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;&.js-next {
    display: block;
    transform: rotateX(90deg) translateZ($half-height);.spinner--right & {
      transform: rotateX(270deg) translateZ($half-height);
    }
  }.js-spin-bwd & {
    &.js-next {
      transform: rotateX(-90deg) translateZ($half-height);
    }
  }
}.js-spin-bwd {
  .spinner--right {
    .spinner__face.js-next {
      transform: rotateX(-270deg) translateZ($half-height);
    }
  }
}.js-active {
  display: block;
  transform: translateZ($half-height);
}.content {
  position: absolute;
  width: 200%;
  height: 100%;
  left: 0;.spinner--right & {
    left: -100%;
  }
}.content__left, 
.content__right {
  position: absolute;
  left: 0;
  top: 0;
  width: 50%;
  height: 100%;
}.content__right {
  right: 0;
  left: auto;
}.content__left {
  background-repeat: no-repeat;
  background-size: cover;&:after {
    position: absolute;
    display: block;
    content: "";
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.1);
  }

  h1 {
    position: absolute;
    top: 50%;
    margin-top: -3vw;
    text-align: center;
    font-family: oswald;
    font-size: 5vw;
    height: 10vw;
    opacity: 1;
    color: #fff;
    width: 100%;
    letter-spacing: 0.15em;
    line-height: 0.6;
  }

  span {
    font-size: 1vw;
    font-weight: 300;
    letter-spacing: 0.2em;
    opacity: 0.9;
    font-family: Merriweather;
  }
}.content__right {
  display: flex;
  align-items: center;
  justify-content: center;.content__main {
    position: absolute;
    font-family: Merriweather, serif;
    text-align: left;
    color: #fff;
    font-size: 1.3vw;
    padding: 0 8vw;
    line-height: 1.65;
    font-weight: 300;
    margin: 0;
    opacity: 0.8;

    p:last-child {

      text-transform: uppercase;
      letter-spacing: 0.15em;
      font-size: 0.85em;
    }
  }.content__index {
    font-size: 30vh;
    position: absolute;
    right: -1vh;
    top: 35vh;
    opacity: 0.04;
    font-family: oswald;
    color: #fff;
  }
}[data-type="iceland"] {
  .content__left {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/215059/iceland.jpg');.spinner--right & {
      background-image: none;
    }
  }
}[data-type="china"] {
  .content__left {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/215059/china.jpg');.spinner--right & {
      background-image: none;
    }
  }
}[data-type="usa"] {
  .content__left {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/215059/usa.jpg');.spinner--right & {
      background-image: none;
    }
  }
}[data-type="peru"] {
  .content__left {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/215059/peru.jpg');.spinner--right & {
      background-image: none;
    }
  }
}
